question_answer 43)

  A rectangular loop of wire ABCD is kept close to an infinitely long wire carrying a current   for and for t > T, Fig. 4(EP).18. Find the total charge passing through a given point in the loop, in time . The resistance of the loop is R.

Answer:

                  In Fig. 4(EP).18, XY is an infinitely long wire carrying current If  is current induced in the loop, then                                      Integrating both sides, we get using (i) of Q.25 ;    The magnitude of charge would be .